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Edexcel C2 20th May 2015 *Official Thread*

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https://c4a3f001dcd45afe69d0ceec83003f9fbc283b2c.googledrive.com/host/0B1ZiqBksUHNYSGtmV3dzVVVvNTg/June%202014%20(R)%20QP%20-%20C2%20Edexcel.pdf

GUYS PLEASE HELP QUESTION 8ii) AND QUESTION 9 a + b + c PLEASE PLEASE PLEASE
Original post by a.a.k
Why not cancwl sin2x

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Yeah did it that way, cancelled sin2x, was easier


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Original post by a.a.k
Why not cancwl sin2x

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Because you 'lose' the solution sin2x=0

Like in x^2+x=0, you don't just cancel the x, you factorise x(x+1) and solve.
Get some sleep guys you'll need it! Good luck with the exam! Make sure you get a good breakfast xD
Anyone know around how many marks is 100 ums? I got 70/75 in the 2014 R paper and I'm feeling pretty proud of myself :banana:
Original post by johnhick98
can someone please explain how to distinguish wether the trapezium rule give and underestimate or everestimate


if there's missed area under the curve its underestimate and if there's extra area is over the curve its overestimate
underover.png7.2KB
Original post by mrnazz00923
ImageUploadedByStudent Room1432072430.114444.jpg ah omg what do i do next? I find this topic really hard 😫


It isn't too hard once you learn how to shift the domain. Here is my full solution for Question 6b, although I haven't checked it against any mark scheme:

solution-6b.png

Original post by mrnazz00923
Yeah did it that way, cancelled sin2x, was easier


Be very careful when you cancel trigonometric functions as you may end up losing some of your final values.
(edited 8 years ago)
Reply 1607
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a.a.k
2
Original post by coefficient
Because you 'lose' the solution sin2x=0

Like in x^2+x=0, you don't just cancel the x, you factorise x(x+1) and solve.


Alright thnx. It all clear now

all clear

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Original post by leoben49
Anyone know around how many marks is 100 ums? I got 70/75 in the 2014 R paper and I'm feeling pretty proud of myself :banana:


100 ums was 75/75 last year i think 70 was around 94 might be wrong though
Reply 1609
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a.a.k
2
Original post by mrnazz00923
Yeah did it that way, cancelled sin2x, was easier


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Was the answer right. I dont think ot was

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Original post by TrentL


8ii
log2(x+15)-1/2log2(x)=4
log2((x+15)/sqrt(x))=4
so 2^4 = (x+15)/sqrt(x)
16 sqrt(x) = x+15

treat as a disguised quadratic where sqrt(x) = y
y^2-16y+15=0
(y-1)(y-15)=0
y=1 or 15
x = 1 or 225
https://c4a3f001dcd45afe69d0ceec8300...%20Edexcel.pdf

GUYS PLEASE HELP QUESTION 8ii) AND QUESTION 9 a + b + c PLEASE PLEASE PLEASE
Original post by Anon_98
What time are you all studying until?

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1 am
Original post by coefficient
8ii
log2(x+15)-1/2log2(x)=4
log2((x+15)/sqrt(x))=4
so 2^4 = (x+15)/sqrt(x)
16 sqrt(x) = x+15

treat as a disguised quadratic where sqrt(x) = y
y^2-16y+15=0
(y-1)(y-15)=0
y=1 or 15
x = 1 or 225


thank you very much most kind!
Original post by SSJ100
1 am


Okay thank you! :smile:

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Original post by TrentL
100 ums was 75/75 last year i think 70 was around 94 might be wrong though


Does that even happen??!??! I thought UMS was supposed to be higher
(edited 8 years ago)
Reply 1616
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a.a.k
2
Original post by SSJ100
1 am


Going to sleep now

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Original post by leoben49
Does that even happen??!??! I thought UMS was supposed to be higher


Yes i have all of last years marks against the boudries and i can see clearly that 70 was infact 92 UMS and 75 was 100
Original post by TrentL
Yes i have all of last years marks against the boudries and i can see clearly that 70 was infact 92 UMS and 75 was 100


wow that's even lower than the real percentage. I'll never understand ums:angry:
Original post by TrentL


i can do 9 in a sec if you want
IMG_3561.jpg542.5KB

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